Question

Methane gas $\left({\text{CH}}_4\right)$ when burns with oxygen $\left({\text{O}}_2\right)$ gives carbon dioxide and water. Write the balanced chemical equation and provide the following information in terms of reactants and products in the equation. [5 Marks]

(a) no. of molecules
(b) no. of moles
(c) molar mass
(d) total mass of reactants and products
What does statement (d) infer?

Answer 1

Balanced chemical reation: 1 Mark
Each part: 1 Mark

1. The balanced chemical equation is:

${\text{CH}}_4\text{(g)}+2{\text{O}}_2\text{(g)}\to 2{\text{H}}_2\text{O(l)}+{\text{CO}}_2\text{(g)}$

Methane + Oxygen $\to$ Water + Carbon dioxide
2.

Statement (d) infers that law of conservation of mass is obeyed.